After passing the LHCb trigger [1]}, candidates are selected with loose cuts
based on the kinematics of the reconstructed particles. For the \(\tau ^-\rightarrow \overline{p}\mu ^+\mu ^-\)  and \(\tau ^-\rightarrow p\mu ^-\mu ^-\)  channels
loose particle identification (PID) requirements are also applied. As the analysis is
performed blind, initially candidates within \(\pm \) 30 MeV/\(c^2\)  of \(m_{\tau }\)  are excluded.
